soundwire: intel: Initialize clock stop timeout

The bus->clk_stop_timeout member is only initialized to a non-zero value
during the codec driver probe. This can lead to corner cases where this
value remains pegged at zero when the bus suspends, which results in an
endless loop in sdw_bus_wait_for_clk_prep_deprep().

Corner cases include configurations with no codecs described in the
firmware, or delays in probing codec drivers.

Initializing the default timeout to the smallest non-zero value avoid this
problem and allows for the existing logic to be preserved: the
bus->clk_stop_timeout is set as the maximum required by all codecs
connected on the bus.

Fixes: 1f2dcf3a154ac ("soundwire: intel: set dev_num_ida_min")
Signed-off-by: Sjoerd Simons <sjoerd@collabora.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Chao Song <chao.song@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20221020015624.1703950-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index 244209358784ffb2c5f9348a497d12b4a2bf2052..8c76541d553f116d951f27cf4f8adbf39fcbe9cd 100644 (file)
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1513,6 +1513,7 @@ static int intel_link_probe(struct auxiliary_device *auxdev,
 
        bus->link_id = auxdev->id;
        bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN;
+       bus->clk_stop_timeout = 1;
 
        sdw_cdns_probe(cdns);